DMD has been unusable on Win32 for a long time because it makes Firefox astonishingly slow to start-up, for complex reasons explained in bug 1241684.
The solution is that same as the solution for Mac in bug 1371397: change DMD so it uses FramePointerStackWalk() instead of MozStackWalk() on Win32. This is what the Gecko Profiler does, and it works well.